1961-63 Pontiac Trophy 4 engine and the 1968-1981 Triumph Slant-4 engine.

Some buses and diesel multiple unit trains take this concept further by mounting the engines horizontally (i.e. with a slant angle of 90 degrees). This is used to reduce the height of the engine, so that it can be located under the floor of the train or bus.

Number of cylinders

* I-twin

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